An atom of calcium loses two electrons. what is the charge on an ion of calcium? question 6 options: a.0 b.–2 c.+2 d.+3

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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